actually shawn, u can't (unless u prove me otherwise).
i just tried to upgrade Win 7 HP to Win 7 Ult, during the setup i selected upgrade and was presented with:
Quote:
To upgrade from one edition of Windows 7 to another edition of Windows 7, use Windows Anytime Upgrade. Cancel the upgrade, open the Start menu, and search for Windows Anytime Upgrade.
so theoretically yes, it's possible to upgrade ultimate to enterprise. whether or not the installer recognises enterprise as ultimate and carries on with the setup, or classes enterprise as a higher level (we know it's the same OS, just different licensing) than ultimate thus requiring a WAU key is unknown, at least by me anyway.
i just wish there was a way to upgrade my 7 HP to ultimate without WAU.